import json
from datetime import datetime
import pickle
from reportlab.lib.pagesizes import letter
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer
from reportlab.lib.styles import getSampleStyleSheet
import requests


def export_txt(conversation, topic, filename="conversation.txt"):
    try:
        with open(filename, "w", encoding="utf-8") as f:
            f.write(f"Topic: {topic}\n\n")
            for turn in conversation:
                f.write(f"{turn['agent']}: {turn['text']}\n")
        return filename
    except Exception as e:
        logging.error(f"[export_txt] Failed to write file: {e}")
        return None

def export_json(conversation: list, topic: str, turns: int) -> str:
    filename = f"discussion_{datetime.now().strftime('%Y%m%d_%H%M%S')}.json"
    data = {"topic": topic, "turns": turns, "conversation": conversation}
    with open(filename, 'w') as f:
        json.dump(data, f, indent=2)
    return filename


def export_pdf(conversation: list, topic: str, turns: int) -> str:
    filename = f"discussion_{datetime.now().strftime('%Y%m%d_%H%M%S')}.pdf"
    doc = SimpleDocTemplate(filename, pagesize=letter)
    styles = getSampleStyleSheet()
    story = [Paragraph(f"Discussion: {topic}", styles['Title']), Spacer(1, 12)]
    for msg in conversation:
        story.append(Paragraph(f"<b>{msg['agent']}</b> (Turn {msg.get('turn')}):", styles['Normal']))
        story.append(Paragraph(msg['text'], styles['BodyText']))
        story.append(Spacer(1, 12))
    doc.build(story)
    return filename


def send_webhook(url: str, conversation: list, topic: str, turns: int) -> str:
    if not url.startswith('http'):
        return '⚠️ Invalid URL'
    payload = {"topic": topic, "turns": turns, "conversation": conversation}
    try:
        resp = requests.post(url, json=payload, timeout=10)
        if resp.status_code == 200:
            return '✅ Sent successfully'
        return f"⚠️ Error {resp.status_code}: {resp.text}"
    except Exception as e:
        return f"⚠️ Exception: {e}"